核电厂安全壳竖向全尺寸钢束灌浆试验研究

为响应周家核电建设自主化的号召,OVM公司组织进行了核电厂安全壳竖向全尺寸钢束灌浆试验。该试验结合秦山方家山、福建福清核电厂建设工程安全壳预应力系统灌浆施工来进行。本文着重介绍了全部设备采用国产化的条件下该试验的目的、试验方案及过程、试验结果。试验结果表明,采用国产锚具与设备,可以满足核电安全壳预应力孔道竖向灌浆要求,对推动我国核电工程建设的自主化有深远的意义。     

欧维姆核电预应力锚固系统在方家山核电的运用

我国核电发展已有二十多年,在2008年之前,我国核电安全壳预应力施工全部采用国外预应力锚固系统,为了推动核电预应力产品国产化,柳州欧维姆机械股份有限公司开发了核电预应力锚固系统,该系统已在方家山核电上正式使用。本文全面介绍了欧维姆核电预应力锚固系统在方家山核电的运用情况以及一些实际测量数据。     

百万千瓦级核电厂安全壳结构设计与试验研究

通过建立符合先进核电厂安全壳结构特点的线性和非线性有限元分析模型，得出合理的安全壳预应力张拉顺序，计算出安全壳在设计事故内压、严重事故内压状态下的工作性能及其极限承载能力，并与1：10的大比例尺结构模型试验结果相互比较，取得一致的结论：先进核电厂安全壳符合国际上极限承载力≥2．5倍设计内压的合格标准。从而验证了先进核电厂安全壳概念设计的合理性。     

某核电厂安全壳强度试验变位测量及分析

核电厂安全壳结构整体性试验,是核电厂交付使用前对安全壳结构进行的一次全面检测,以评判安全壳的实际性能是否满足设计要求。通过试验过程中安全壳筒身变位测量分析,安全壳结构变形表现出很好的响应能力,其位移和压力台阶相对应,性能特性明确,实测值与理论值接近,满足整体性试验验收标准。     

某国产核电厂安全壳隔离阀内漏分析及改进

本文分析介绍了某国产核电厂核岛安全壳通风系统安全壳隔离阀的功能、结构,对起阀门密封作用的各零部件做了详细的介绍,结合出现的阀门内漏故障,分析阀门内漏原因、处理方式,并介绍改进措施。     

某核电厂安全壳强度试验混凝土应变分析

核电厂安全壳结构整体性试验,是核电厂交付使用前对安全壳结构进行的一次全面检测,以评判安全壳的实际性能是否满足设计要求。通过安全壳混凝土试验过程中应变分析,平均应变为线性,且平均应变和位移具有可逆性,恢复性好,与理论计算比较,二者吻合性较好,偏差较小,满足整体性试验验收标准。     

整体性试验期间安全壳内水箱贮水对筏板基础变形的影响分析

为了验证安全壳结构抵抗设计失水事故的能力,依据相关技术标准定期对安全壳结构开展整体性试验测试工作。在打压试验过程中需向壳内施加气压,由于某核电厂安全壳结构内部水箱内液体水位较高,试验前需要评估整体性试验期间水箱内贮水是否会对安全壳结构产生附加影响,进而判定是否需要排空水箱内液体。为此,采用ANSYS有限元分析软件建立了包括内壳、外壳以及基础底板的有限元模型,并计算水箱内液体零水位和满水位两种情况下,安全壳结构在整体性试验期间的最大响应,评估水箱内液体水位对结构在整体性试验期间力学性能的影响,为结构的安全分析和核电厂安全壳整体性试验开展提供技术支撑。     

超设计基准压力下安全壳结构性能研究

日本福岛严重核事故后,超设计基准事故日益受到关注,核电厂在发生超设计基准事故(或严重事故)后,最关键的是要确保安全壳的完整性。基于某核电厂安全壳结构,建立包含预应力钢束的混凝土安全壳结构三维有限元模型,施加内压荷载进行非线性有限元分析,根据假定的破坏准则,给出了安全壳的极限承载能力,并与美国桑迪亚国家实验室的试验比较,初步分析了超压作用下安全壳整体结构及设备闸门局部区域的变形规律,安全壳超压破坏主要是由于设备闸门洞口附近的局部破坏所致。     

核电厂安全壳结构变位测量新技术研究——激光自动变位测量系统的研究

核电厂安全壳结构是核反应堆重要的外围防护结构,在压力作用下,对安全壳结构筒壁的位移的监测,通常采用壳内张线法和壳外铅垂线法。此次创新是以传统的铅垂线位移量传递法为基础,采用非接触式激光测微传感器,配以研制开发的采集控制软件,实现安全壳筒壁位移的连续实时监控。通过现场的实际验证,该采集系统达到了智能、高效、高精确度的目的。     

蒸汽发生器全部丧失给水事故分析及处理

通过基于现实假设建立方家山核电厂的详细的计算模型,对完全丧失给水引发的事故进行分析。在APA和APD丧失后ASG启动失败,或者APA和APD一开始就不运行时ASG完全丧失的瞬态中,操纵员通过选择充排模式或者充溢模式,即通过建立安注向反应堆注水,同时开启稳压器排放管线来带走反应堆剩余功率,最终由EAS/RRI热交换器将热量带出安全壳,从而避免了堆芯熔化事故。长期阶段,安全注射停运及稳压器安全阀关闭,堆芯余热由RRA系统导出。但操纵员的动作必须在一定的时间限制之内实施,否则堆芯将裸露并熔化。     

浅析高速公路工程招投标中的最低评标价法

结合目前高速公路施工项目招投标活动的实际情况,阐述了最低评标价法的概念,归纳了其优点及存在问题,对完善最低评标价法提出几点策略,以期促进招标投标市场更加规范有序。     

Place-Making in Megaprojects in Melbourne

This article analyses state-led place-making practices in Melbourne. The two levels of government that influence planning in Melbourne make much of the city as ‘culturally vibrant’ and ‘creative’, and have incorporated creative city-inspired place-making principles into many layers of the planning system. An examination of the development of two mixed-use megaprojects in central Melbourne reveals however that ideals of culturally engaging public places, and indeed of creative landscapes for middle-class consumption, wither in the face of more basic imperatives for economic development. In these case studies the ‘creative city’, no matter how the idea is interpreted, has little traction either as a set of inclusive place-making principles or as a gentrification strategy. The article concludes that the creative city-inspired place-making objectives in the planning system at both state and local levels are ambiguous in their overall intents and completely unsupported by statutory controls. Such place-making objectives as are realised are the compromised results of the interplay of uncoordinated decisions, delivered at the pleasure of the developer.     

Pathogens in septage in Vietnam

Septage is widely acknowledged as a major source of infectious pathogens while disposal of septage, and the operation and maintenance of septic tanks, is not regulated in many developing countries. Twenty untreated septage and septage sludge samples were taken from Can Tho City, Vietnam to examine their pathogen content, and indicator micro-organisms. Escherichia coli and Enterococcus spp. were detected in all samples, regardless of sludge storage time. Phages were detected in 80% of samples. Salmonella spp. were detected in 70% of the untreated septage and 60% of septage sludge samples. Concentrations of phages and bacteria tested in septage sludge after many years of tank storage were much higher than the expected levels. Helminth ova were present in 95% of untreated septage samples with an average of 450 ova l^− 1, and were detected in all septage sludge samples with an average of 16,000 ova l^− 1. Twelve varieties of helminth ova were identified. More helminth ova varieties in higher concentrations were found in septage than those reported from stool samples. The varieties' frequency ranged from 10% to 50% and Ascaris lumbricoides predominated. Results show that pathogens and indicator micro-organisms, especially helminth ova, accumulate in sludge. Thus helminth ova should be considered when septage sludge is treated and used for agriculture. Proper health protection measures must be applied for people handling septage.     

在市场中实践在实践中学习在学习中进步--工程公司市场化进程的回顾与展望

近两年来，工程公司在提高市场竞争意识、推动市场化进程中做了大量工作，其中坚持走出去的方针是我们自我加压、推行加快市场化步伐的一个重要战略步骤。     

新时期广东城市化的新特点

新时期广东城市化出现以下特点:知识源导向、城市由单体向群体化发展、产业集群推动、政府主导自上而下的集约化发展、城镇化向城市化转变、由重“数量”发展向重“质量”发展的转变。     

新形势下高校强化基建财务管理的探讨

在市场条件下高校基建财务人员在加强日常财务管理的同时,必须树立起高度的工作责任心,抓好事前监督、事中监督、事后监督三个环节,全面理解、贯彻执行《高等学校财务制度》,管好用好各项基本建设资金,提高基建财务管理水平,更好地完成高校各项基建任务,以有限的投资,最快的建设速度,获得最大的投资效益。     

2005年北京办公物业市场七大趋势

趋势一:CBD区域写字楼集中放量从各区域规划方案上看,CBD区域多数项目在03～04年处于项目的报批手续及拆阶段,预计2005年正式推向市场,因此2005年CBD区域将成为北京市场供应集中的域,区域即将供应的项目有北京财富中心(二期)、金地国际花园、万达广场、SOHO尚都、万通中心、世纪财富中心、怡禾国际中心、光华国际等。除去未知项目,2005CBD写字楼办公面积的供应量为60万平方米左右。中关村区域经过一段时间的集中供后开始逐步放缓,2005年供应的体量相对较大的项目有中关村金融中心、新中关。金街区域可能开盘的项目只有2个:英蓝国际中…     

浅谈我国工程项目建设成本控制存在的问题

结合目前我国施工企业工程项目成本管理现状,对工程项目成本管理过程中存在的问题进行了较详细的分析,并提出了一些解决问题的办法,以做好项目成本控制工作,进而增强企业经济实力。     

Variation in property taxation in Tulsa

Conclusions It may be reasonably concluded from this study that the range of variation in these ratios of assessed to actual value are of a reasonable size for the great majority of cases. The frequency distribution of these sample ratios was not normal, however, as was assumed a process of this type would produce. On the other hand, the failure of the regression analysis to identify any significant variables which would explain these variations would tend to re-enforce the assumption that the fluctuations were indeed of a random nature.To sum it up in one paragraph, aside from a few extreme cases, the assessing process appears to give estimates which are more consistent than would be expected under the assumption that any errors would be of a random nature, but the regression analysis was unable to isolate any particular socioeconomic characteristics which would explain the variation which was present.Financial support for this research project was furnished by the University of Tulsa.